24 Hour Digital, Indoor, Flip Switch, Battery Operated Timer, Fits Over Existing Wall Plate & Automatically Flips The Toggle Switch At Programmed Times, Perfect For Turning On & Off Overhead Lighting, Ceiling Fans, Porch Lighting & Other Outlets Controlled By A Wall Switch, No Wiring Required, Up To 2 On/Off Settings Per Day, Settings Repeat Daily, Fits Single Or Multi-Gang Wall Switch, Simple Set 4 Button Programming, Convenient Manual Override Button, Daylight Savings Time, Low Battery Alert, , Uses 2 "AA" Batteries, Not Included.